Due to the delay of the game's release, the game's developers, Ready at Dawn, offered a "special edition" version of the demo to pre-order customers, with one dev members stating that preparation of the special edition took up to 40% of the team's production time.
The game was originally designed for the Playstation Portable's restricted 222 megahertz (MHz) processor. Ready at Dawn repeatedly contacted Sony regarding increasing the clock speed of the PSP on account of the difference to the game, and had developed a version of the game with higher speed. Sony released a firmware upgrade that allowed games to use the full 333 MHz processor. The faster processor allowed for more realistic blood effects, lighting effects, and shadows as well as improved enemy intelligence. The upgrade, however, noticeably decreases battery life.
After the game's completion, Game Director Ru Weerasuriya stated multiplayer options and other puzzles, characters, and dialogue had to be removed due to time constraints.